Windshield



WINDSHIELD Feb. 23 1926.

M. B. MGGRAW Filed April 14, 1922 cation.

Patented Feb. z3, 192e..

' UNITED STATES' Pa'lrv`-u'r OFFICE nnn'rm n. naamw, or BEAVER FALLS, PENNSYLVANIA.`

wINDsHIELD.

. v Application filed April 14, 1,922. Serial No. 552,623.

To all whom it may concer/nf Be it known that I, MARTIN B. McGnAw, a citizen of the United States, residing at Beaver Falls, in the county of Beaver and State of Pennsylvania,..have invented certain new and useful Improvements in Wind-v shields, of which the following is a specifi- This application is for matter shownv in my application No. 414,687,Y filed Oct. ,4, 1920 The object of the invention -is to provide a windshieldwhich will'be kept free and clear of all dust, snow, rain or other flying tion maybe made use of wherever .it is desired .to protect a transparent member from obstruction.

The drawing illustrates-the preferred embodiment of the'invention. v

Figure lis a'diagrammatic side .elevation of a conventional type of automobile with my device applied thereto.

Fi ure 2 is a front elevation of my windshield.

Figure 3 is a transverse section through the frame thereof showing the manner of securing the glass in the frame.

A represents a conventional type of automobile provided with my improved windshield B The frame of my windshieldv is constitutedby a tubular member 6 having s aced, inwardly extending flanges 9 provided with continuous grooves or pockets 10 in which the gaskets 11, of rubber or analogous material, are securely seated. The edge" portions of the glassV extend between the projectin flanges 9 and are,vv firmly gripped there y. The gaskets 11 serve to cushion the glass and 'to form a joint between the glass and the tube which willbe air-tight and water-tight. It will be noted that the tubular member 6 is provided adjacent the forward grooves 10 with a series of equidistant apertures 7 for a' purpose to be later stated.

The lower portion of the tubular fra-mc is connected to rn air-pump C by meansV of a l tube 5. .'l-he air-pump is driven from a shaft 4 which is driven bybelt 4lfrom the usual fan shaft 2 of themotor l. It will thus be seen that as long as the engine is in operation the pump will be continuously` driven and will force lthe airv through the tube 5 and into the tubular frame ofthe wmdshleld. Here the air will be projected with considerable force through the rela-- tively small apertures 7 and will form a screen or curtain of air which will effectively prevent' iying 'particles' of snow, or rain, or'particles of dust from striking the windshield. Should any particles nevertheless allght upon the windshield, as when the vehicle is parked for a period of time, the jets of air will also serve to clear the windshield of such obstructions.

It will be noted that y the greater th'e velocity of the vehicle and therefore the greater the relative velocity of the flying particles, the greater willbe the velocity of the air shot from the apertures 7 Thusthe device is effective at even the highest speeds. If desired, the glass of the windshield may be removed and the curtain of air will be found to efectually shield the occupants from flying particles.

My evice may be used on windows for locomotive cabs, onrailway and street car windows and Vfor the windows. When used or the last named purpose, the air supplied the pump should be heated by contact with a suitable heating surface. I do not desire to `limit myself to the specific use illustrated but intend to cover all fair equivalents of the followingv claims.

I claim:l

1. In a protecting device a hollow. frame member adapted to receive a pane of glass and provided with a series of symmetrically arranged apertures, and means for supplying the frame member with air under pressure, said air passing outwardly through said apertures. v

2. A windshield comprising a tubular frame member, transparentmaterial secured therein, and means for supplying the frame member with air under pressure, said frame rotection of show member being so formed and arranged as to direct the ejection of a (protecting curtain of air infront of the win shield'.

3. A frame member of substantially. tu-

bular shape in cross-section provided with integral parallel flanges ada ted to clamp a sheet of transparent ma rial therebetween, said member being provided with spaced apertures adjacent one of the anges.

4. In a motor vehicle, a windshield comprising a frame member adapted to. project therefrom a protecting current of air and means for supplying the frame member with air under pressure comprising an air-pump, connections between the pump and the frame member, and means for driving the pump from the usual automobile engine.

5. A windshield frame of sheet metal tubing, slotted to receive and clamp a sheet of glass therein, and means for sealing the joint between the glass and the frame, the tubing being rovided with openings adjacent to the s ot for the passage of gas under pressure therefrom.

6. In a rotecting device, a hollow frame member a apted to receive 4a pane of glass,l

means for supplying the frame member with air under pressure, and said frame member being apertured so as to direct the air across the lass, whereby the moving air'serves to shiel and cleanse the latter. l V 7. A hollow frame, a pane of trans arent material ada ted to be recved an suprted in sai frame, and means for supplying the interior of said frame with a forced circulation of heated gas in direct contact with the walls of said frame.

8. A hollow frame member, a pane of transparent material received and su ported in said member, means for supplying the said frame member with heated air under pressure, said frame member being apertured so as to project the heated air therefrom in such direction as to shield the pane from flying particles of dust and to remove such partie es therefrom.

MARTIN B. MCGRAW. 

